Everything got risks, when it comes to gambling and trading the risk is very big. Leverage trading/binary option trading is always related with gambling for some reason. Another thing that makes people and government to have a comparison of bitcoin with gambling is based on its increased usage as well as the early days use on gambling in large scale than other needs.
Leveraging and binary option is even still far better than gambling because it is not much of a game of luck, it is something that if you apply a very great strategy to, you will be sure of making money from it, but gambling, there is no way that you can ever use strategy for it, it then strictly pure game of luck.
Now when it come to bitcoin and gambling, government does not really know what they are doing by liking both because it has no correlation at all, the main purpose of bitcoin is for investment and people only saw that little opportunity of investing in it, but gambling is just a game that requires the service of cryptocurrency to get better in its operation, so there is no much similarity between the bitcoin system and gambling system at all.